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Make your own speaker with a magnet, wire, and paper cup! If you have a radio with a headphone plug and an old pair of headphones, this is a great tinkering activity.

$1 - $5 per student Ages 8 - adult 10 to 30 minutes
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This activity guide includes instructions on how to build a "Shake Table" by mounting an eccentric mass (off center) on the shaft of a small dc motor.

Over $20 per group Ages 11 - 18 45 to 60 minutes
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Create an instrument that you don't play--you just listen to it through tubes of various lengths.

1 cent - $1 per student Ages 4 - 14 5 to 10 minutes
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With a bit of PVC, a laser, a can/cup, and a small mirror, you can make a device that visualizes you voice or any sound transmitted into the cup/can.

free Ages 8 - adult 10 to 30 minutes
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If you got a big graduated or clear cylinder, water, a pipe, and a tuning fork, you've got a sound learning opportunity! Learn about resonance with this Exploratorium Science Snack.

free Ages 6 - 14 5 to 10 minutes
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Things that are different sizes and stiffness vibrate differently, and in this Exploratorium Science Snack, you'll see how rings of various diameters react to vibration and external forces.

1 cent - $1 per student Ages 8 - 18 5 to 10 minutes